When Both Lactose and Glucose Are Available to E

question 38

Multiple Choice

When both lactose and glucose are available to E.coli,which part of the lac operon regulation assures that glucose will be metabolized first?

• A)CAP binds to cAMP and then to the promoter only in the presence of low glucose.
• B)The repressor cannot bind to the operator in the presence of lactose.
• C)Permease allows lactose to enter the cell when lactose enters the cell.
• D)The repressor binds to the operator in the absence of lactose.
• E)RNA polymerase transcribes the lac operon to make a single RNA molecule.

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Definitions:

Equilibrium Quantity

The quantity of goods or services that is supplied and demanded at the equilibrium price in a market.

Unregulated Market

A market where economic activities are freely carried out without governmental intervention in terms of prices, production, and distribution.

Shortage

A situation where the demand for a product or service exceeds the supply available at a specific price.

Product

Any good, service, or idea that can be offered to a market to satisfy a want or need.